#define _CRT_SECURE_NO_WARNINGS
#include <stdio.h>
#include <assert.h>

size_t my_strlen1(const char* str){
	size_t count = 0;
	assert(str);
	while (*str) {
		count++;
		str++;
	}
	return count;
}

int main() {
	char arr[] = "abcdef";
	printf("%zu", my_strlen1(arr));
	return 0;
}